X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=lib%2FMouse%2FMeta%2FClass.pm;h=bf3276ae56227949c947370441bf7b36ccac217b;hb=181502b9e199623db8915eed96ad5f7f2c478835;hp=c43c12d44e2974e01e48e1c019aefd99514f32fd;hpb=58af95b87869e95b132806405054324491903fa1;p=gitmo%2FMouse.git

diff --git a/lib/Mouse/Meta/Class.pm b/lib/Mouse/Meta/Class.pm
index c43c12d..bf3276a 100644
--- a/lib/Mouse/Meta/Class.pm
+++ b/lib/Mouse/Meta/Class.pm
@@ -1,12 +1,24 @@
 #!/usr/bin/env perl
-package Mouse::Class;
+package Mouse::Meta::Class;
 use strict;
 use warnings;
 
+use Scalar::Util 'blessed';
+use Carp 'confess';
+
 use MRO::Compat;
 
 do {
     my %METACLASS_CACHE;
+
+    # because Mouse doesn't introspect existing classes, we're forced to
+    # only pay attention to other Mouse classes
+    sub _metaclass_cache {
+        my $class = shift;
+        my $name  = shift;
+        return $METACLASS_CACHE{$name};
+    }
+
     sub initialize {
         my $class = shift;
         my $name  = shift;
@@ -18,7 +30,7 @@ do {
 
 sub new {
     my $class = shift;
-    my %args = @_;
+    my %args  = @_;
 
     $args{attributes} = {};
     $args{superclasses} = do {
@@ -49,29 +61,78 @@ sub add_attribute {
     $self->{'attributes'}{$attr->name} = $attr;
 }
 
+sub compute_all_applicable_attributes {
+    my $self = shift;
+    my (@attr, %seen);
+
+    for my $class ($self->linearized_isa) {
+        my $meta = $self->_metaclass_cache($class)
+            or next;
+
+        for my $name (keys %{ $meta->get_attribute_map }) {
+            next if $seen{$name}++;
+            push @attr, $meta->get_attribute($name);
+        }
+    }
+
+    return @attr;
+}
+
 sub get_attribute_map { $_[0]->{attributes} }
+sub has_attribute     { exists $_[0]->{attributes}->{$_[1]} }
 sub get_attribute     { $_[0]->{attributes}->{$_[1]} }
 
 sub linearized_isa { @{ mro::get_linear_isa($_[0]->name) } }
 
+sub clone_object {
+    my $class    = shift;
+    my $instance = shift;
+
+    (blessed($instance) && $instance->isa($class->name))
+        || confess "You must pass an instance of the metaclass (" . $class->name . "), not ($instance)";
+
+    $class->clone_instance($instance, @_);
+}
+
+sub clone_instance {
+    my ($class, $instance, %params) = @_;
+
+    (blessed($instance))
+        || confess "You can only clone instances, ($instance) is not a blessed instance";
+
+    my $clone = bless { %$instance }, ref $instance;
+
+    foreach my $attr ($class->compute_all_applicable_attributes()) {
+        if ( defined( my $init_arg = $attr->init_arg ) ) {
+            if (exists $params{$init_arg}) {
+                $clone->{ $attr->name } = $params{$init_arg};
+            }
+        }
+    }
+
+    return $clone;
+
+}
+
+
 1;
 
 __END__
 
 =head1 NAME
 
-Mouse::Class - hook into the Mouse MOP
+Mouse::Meta::Class - hook into the Mouse MOP
 
 =head1 METHODS
 
-=head2 initialize ClassName -> Mouse::Class
+=head2 initialize ClassName -> Mouse::Meta::Class
 
-Finds or creates a Mouse::Class instance for the given ClassName. Only one
-instance should exist for a given class.
+Finds or creates a Mouse::Meta::Class instance for the given ClassName. Only
+one instance should exist for a given class.
 
-=head2 new %args -> Mouse::Class
+=head2 new %args -> Mouse::Meta::Class
 
-Creates a new Mouse::Class. Don't call this directly.
+Creates a new Mouse::Meta::Class. Don't call this directly.
 
 =head2 name -> ClassName
 
@@ -81,22 +142,41 @@ Returns the name of the owner class.
 
 Gets (or sets) the list of superclasses of the owner class.
 
-=head2 add_attribute Mouse::Attribute
+=head2 add_attribute Mouse::Meta::Attribute
 
-Begins keeping track of the existing L<Mouse::Attribute> for the owner class.
+Begins keeping track of the existing L<Mouse::Meta::Attribute> for the owner
+class.
 
-=head2 get_attribute_map -> { name => Mouse::Attribute }
+=head2 compute_all_applicable_attributes -> (Mouse::Meta::Attribute)
+
+Returns the list of all L<Mouse::Meta::Attribute> instances associated with
+this class and its superclasses.
+
+=head2 get_attribute_map -> { name => Mouse::Meta::Attribute }
 
 Returns a mapping of attribute names to their corresponding
-L<Mouse::Attribute> objects.
+L<Mouse::Meta::Attribute> objects.
+
+=head2 has_attribute Name -> Boool
+
+Returns whether we have a L<Mouse::Meta::Attribute> with the given name.
 
-=head2 get_attribute Name -> Mouse::Attribute | undef
+=head2 get_attribute Name -> Mouse::Meta::Attribute | undef
 
-Returns the L<Mouse::Attribute> with the given name.
+Returns the L<Mouse::Meta::Attribute> with the given name.
 
 =head2 linearized_isa -> [ClassNames]
 
 Returns the list of classes in method dispatch order, with duplicates removed.
 
+=head2 clone_object Instance -> Instance
+
+Clones the given C<Instance> which must be an instance governed by this
+metaclass.
+
+=head2 clone_instance Instance, Parameters -> Instance
+
+Clones the given C<Instance> and sets any additional parameters.
+
 =cut